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Class Information
Number: 379/384
Name: Telephonic communications > Supervisory or control line signaling > Using line or loop condition detection (e.g., line circuit) > Of plural lines > By scanning
Description: Subject matter where a condition of each of the plural loops or lines is detected by sensing each line in sequence.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7190769 |
Apparatus for controlling operation of a recording device with a telephone instrument |
Mar. 13, 2007 |
| 7095824 |
Instructive out-of-service telephone lines |
Aug. 22, 2006 |
| 6920220 |
Pre-zero crossing signal generator for sinusoidal voltages with DC offsets such as telephone ring voltages |
Jul. 19, 2005 |
| 6137420 |
Selective call radio receiver and a data transmission method |
Oct. 24, 2000 |
| 5796817 |
Hybrid circuit for an electric operating and scanning interface, applicable to electronic recorders of electromechanical telephone stations |
Aug. 18, 1998 |
| 5675643 |
Line card that provides remote line activation and soft dialtone |
Oct. 7, 1997 |
| 5636262 |
Interface scanning circuit |
Jun. 3, 1997 |
| 5608791 |
Group exchange port (GXP) |
Mar. 4, 1997 |
| 5577114 |
Subscriber line control apparatus to concurrently detect change in line state for subscriber lines and determine validity of timer device |
Nov. 19, 1996 |
| 5471525 |
Line status display system for telephone exchange system |
Nov. 28, 1995 |
| 5200996 |
Station controller for multi-line pick-up and automatic monitoring of telephone station moves |
Apr. 6, 1993 |
| 5083308 |
Arrangement for determining switch port status at an adjunct processor |
Jan. 21, 1992 |
| 4849962 |
Communications control unit |
Jul. 18, 1989 |
| 4811014 |
Circuit arrangement for telecommunications systems, particularly telephone switching systems, comprising information interrogating devices cyclically driving inquiry locations |
Mar. 7, 1989 |
| 4785298 |
Circuit arrangement for telecommunications systems, particularly telephone switching systems, comprising an information interrogating device which cyclically drives inquiry locations |
Nov. 15, 1988 |
| 4744103 |
Computer controlled multi-link communication system |
May. 10, 1988 |
| 4734933 |
Telephone line status circuit |
Mar. 29, 1988 |
| 4631362 |
Low resistance origination scan circuit |
Dec. 23, 1986 |
| 4600813 |
Line concentrator |
Jul. 15, 1986 |
| 4593156 |
Grounded tip detector |
Jun. 3, 1986 |
| 4539437 |
Stored program power control system for improving energy efficiency for telephone sets connected into a local telephone communications system |
Sep. 3, 1985 |
| 4383137 |
Key telephone system with multiple processor control |
May. 10, 1983 |
| 4336424 |
Circuit arrangement for monitoring operating conditions of direct current devices |
Jun. 22, 1982 |
| 4331956 |
Control means for a solid state crossbar switch |
May. 25, 1982 |
| 4327253 |
Circuit arrangement for consecutively monitoring operating conditions of direct current devices |
Apr. 27, 1982 |
| 4320259 |
Electronic selector for telecommunications switching |
Mar. 16, 1982 |
| 4282408 |
On-hook/off-hook detector circuit |
Aug. 4, 1981 |
| 4220824 |
Interface linking synchronous sense and drive matrices of telephone system with a processor of signalization data |
Sep. 2, 1980 |
| 4216355 |
Telephone line monitoring apparatus |
Aug. 5, 1980 |
| 4211895 |
Electronic telephone system with time division multiplexed signalling |
Jul. 8, 1980 |
| 4196316 |
Program controlled communication system having individually rearrangeable line selection |
Apr. 1, 1980 |
| 4176256 |
Circuit arrangement for time-dependent monitoring of the state of lines |
Nov. 27, 1979 |
| 4174466 |
Multi-party telephone system allowing speech connection between extensions as between extensions and an outer line |
Nov. 13, 1979 |
| 4150258 |
Electronic switching system |
Apr. 17, 1979 |
| 4140880 |
Hold tone scanner |
Feb. 20, 1979 |
| 4139739 |
Telecommunications call back system |
Feb. 13, 1979 |
| 4117278 |
Service observing terminal |
Sep. 26, 1978 |
| 4113989 |
Electronic telephone system featuring switching networks having thyristors for single-wire switching |
Sep. 12, 1978 |
| 4105873 |
Electronic telephone switching system comprising a speech path switching matrix and tone-connecting switching matrix and employing electronic crosspoint switches |
Aug. 8, 1978 |
| 4105875 |
Electronic telephone switching system comprising a speech-path switching matrix and tone-connecting matrix and employing electronic crosspoint switching devices |
Aug. 8, 1978 |
| 4103113 |
Attendant console control system |
Jul. 25, 1978 |
| 4088845 |
Relay matrix switch |
May. 9, 1978 |
| 4088841 |
Telecommunication systems with captive condition surveillance and release |
May. 9, 1978 |
| 4079206 |
Switching arrangement for a telephone system for connecting a calling subscriber set to an idle connector set upon recognizing a loop in the connector set |
Mar. 14, 1978 |
| 4064371 |
Apparatus for a key telephone system for enabling intercom substations to access trunk lines |
Dec. 20, 1977 |
| 4041465 |
Scanner-distributor apparatus for matrix system |
Aug. 9, 1977 |
| 4041464 |
Data processing systems |
Aug. 9, 1977 |
| 4040036 |
Input grouping arrangement for data gathering |
Aug. 2, 1977 |
| 4038498 |
Central office switching system with remote line switch |
Jul. 26, 1977 |
| 4024361 |
Method of and means for identifying temporarily coacting units in a telecommunication system |
May. 17, 1977 |
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